Metric grommets are specified using metric dimensions, usually millimeters. The term describes the units used for sizing, not a particular material or protection rating.
For a panel-mounted grommet, compare the mounting-hole diameter, panel thickness and cable passage with the drawing. When converting an inch specification, keep enough precision to assess the fit and check the actual tolerances.
A correctly fitted grommet can reduce cable contact with the opening's edge. Durability depends on the compound, profile and service conditions; it cannot be inferred from flexibility alone. Confirm sealing and cable-retention requirements separately if the application needs more than edge protection.
